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  C语言：函数指针函数作为参数函数作为返回值
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  <h3 id="示例代码"><a href="#示例代码" class="headerlink" title="示例代码"></a>示例代码</h3><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;stdio.h&gt;</span></span></span><br><span class="line"></span><br><span class="line"><span class="comment">/*</span></span><br><span class="line"><span class="comment">    函数指针            int (*fp)(int, int)</span></span><br><span class="line"><span class="comment">    函数指针作入参       </span></span><br><span class="line"><span class="comment">    函数指针作返回值  </span></span><br><span class="line"><span class="comment">*/</span></span><br><span class="line"></span><br><span class="line"><span class="type">int</span> <span class="title function_">add</span><span class="params">(<span class="type">int</span>, <span class="type">int</span>)</span>;</span><br><span class="line"><span class="type">int</span> <span class="title function_">sub</span><span class="params">(<span class="type">int</span>, <span class="type">int</span>)</span>;</span><br><span class="line"><span class="type">int</span> <span class="title function_">compt</span><span class="params">(<span class="type">int</span> (*)(<span class="type">int</span>,<span class="type">int</span>),<span class="type">int</span>,<span class="type">int</span>)</span>;</span><br><span class="line"><span class="type">int</span> (*select(<span class="type">char</span>))(<span class="type">int</span>, <span class="type">int</span>);</span><br><span class="line"></span><br><span class="line"><span class="type">int</span> <span class="title function_">add</span><span class="params">(<span class="type">int</span> a,<span class="type">int</span> b)</span>&#123;</span><br><span class="line">    <span class="keyword">return</span> a+b;</span><br><span class="line">&#125;</span><br><span class="line"><span class="type">int</span> <span class="title function_">sub</span><span class="params">(<span class="type">int</span> a,<span class="type">int</span> b)</span>&#123;</span><br><span class="line">    <span class="keyword">return</span> a-b;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">// 函数指针作入参的例子</span></span><br><span class="line"><span class="type">int</span> <span class="title function_">compt</span><span class="params">(<span class="type">int</span> (*fp)(<span class="type">int</span>,<span class="type">int</span>),<span class="type">int</span> a,<span class="type">int</span> b)</span>&#123;</span><br><span class="line">    <span class="keyword">return</span> (*fp)(a,b);</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">// 函数指针作返回值的例子</span></span><br><span class="line"><span class="type">int</span> (*select(<span class="type">char</span> o))(<span class="type">int</span> a,<span class="type">int</span> b)&#123;</span><br><span class="line">    <span class="keyword">switch</span> (o)</span><br><span class="line">    &#123;</span><br><span class="line">    <span class="keyword">case</span> <span class="string">&#x27;+&#x27;</span>:</span><br><span class="line">        <span class="keyword">return</span> add;</span><br><span class="line">    <span class="keyword">case</span> <span class="string">&#x27;-&#x27;</span>:</span><br><span class="line">        <span class="keyword">return</span> sub;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="type">int</span> <span class="title function_">main</span><span class="params">()</span>&#123;</span><br><span class="line">    <span class="type">int</span> rest;</span><br><span class="line"></span><br><span class="line">    <span class="comment">// 函数指针作入参的例子</span></span><br><span class="line">    rest = compt(add,<span class="number">1</span>,<span class="number">2</span>);</span><br><span class="line">    <span class="built_in">printf</span>(<span class="string">&quot;a+b = %d\n&quot;</span>,rest);</span><br><span class="line">    rest = compt(sub,<span class="number">1</span>,<span class="number">2</span>);</span><br><span class="line">    <span class="built_in">printf</span>(<span class="string">&quot;a-b = %d\n&quot;</span>,rest);</span><br><span class="line"></span><br><span class="line">    <span class="comment">// 函数指针作返回值的例子</span></span><br><span class="line">    <span class="type">char</span> o;</span><br><span class="line">    <span class="type">int</span> a,b;</span><br><span class="line">    <span class="type">int</span> (*fp)(<span class="type">int</span>, <span class="type">int</span>);</span><br><span class="line">    <span class="built_in">printf</span>(<span class="string">&quot;请输入计算式（例如2+3）：&quot;</span>);</span><br><span class="line">    <span class="built_in">scanf</span>(<span class="string">&quot;%d%c%d&quot;</span>,&amp;a,&amp;o,&amp;b);</span><br><span class="line">    fp = select(o);</span><br><span class="line">    rest = compt(fp,a,b);</span><br><span class="line">    <span class="built_in">printf</span>(<span class="string">&quot;rest = %d\n&quot;</span>,rest);   </span><br><span class="line">&#125;</span><br><span class="line"></span><br></pre></td></tr></table></figure>

<h3 id="运行结果"><a href="#运行结果" class="headerlink" title="运行结果"></a>运行结果</h3><figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">[root@wei07 c]# gcc a.c &amp;&amp; a.out</span><br><span class="line">a+b = 3</span><br><span class="line">a-b = -1</span><br><span class="line">请输入计算式（例如2+3）：0-9</span><br><span class="line">rest = -9</span><br><span class="line">[root@wei07 c]#</span><br><span class="line"></span><br></pre></td></tr></table></figure>

 
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